Light source device and control method

Abstract

The disclosure provides a light source device and a control method. The light source device includes a plurality of LED light bars; a voltage converter, coupled to the plurality of LED light bars, is used to convert an input voltage into an output voltage according to a voltage control signal; a switch module, coupled to The plurality of LED light bars are used to sequentially turn on the plurality of LED light bars according to a scanning control signal; and a control unit is used to determine the LED light bars to be turned on according to the scanning control signal And obtain a preset driving voltage value corresponding to the LED light bar to be turned on, and generate the voltage control signal corresponding to the LED light bar to be turned on to the voltage converter, so as to provide the voltage conversion converter for voltage conversion. The invention can effectively avoid the problems of extra power loss and component overheating caused by the difference of the total forward voltage of each light emitting diode light bar.

Description

Technical field [0001] The invention refers to a light source device and a control method, in particular to a light source device and a control method that can dynamically adjust the output voltage in real time. Background technique [0002] Compared with traditional light sources, light-emitting diodes (Light Emitting Diode, LED) have the advantages of energy saving and power saving, long component life, no mercury, rich color gamut, no warm-up time, and fast response speed. It has been widely used as a light source for display and lighting. For example, the backlight module of a traditional liquid crystal display panel uses Cold Cathode Fluorescent Lamp (CCFL) as the light source. Nowadays, as the luminous efficiency of light-emitting diodes continues to increase and the cost decreases, light-emitting diodes gradually replace cold cathode fluorescent tubes as the light source of backlight modules. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram of a light...

AI Technical Summary

Problems solved by technology

In this case, for each LED light bar, if the driving voltage VD provided by the voltage converter 102 is greater than the total forward voltage of the individual LED light bar, the corresponding switch unit of the individual LED light bar There will be additional cross-voltage, which will increase the additional power loss and reduce the efficiency of voltage conversion, and may cause the problem of overheating of the switching unit

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